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SubjectRe: [PATCH 2/2] cpusets,isolcpus: add file to show isolated cpus in cpuset
> +static void cpuset_seq_print_isolcpus(struct seq_file *sf, struct cpuset *cs)
> +{
> + cpumask_var_t my_isolated_cpus;
> +
> + if (!alloc_cpumask_var(&my_isolated_cpus, GFP_KERNEL))
> + return;
> +

Make it return -ENOMEM ? Or make it a global variable and allocate memory for it
in cpuset_init().

> + cpumask_and(my_isolated_cpus, cs->cpus_allowed, cpu_isolated_map);
> +
> + seq_printf(sf, "%*pbl\n", nodemask_pr_args(my_isolated_cpus));
> +
> + free_cpumask_var(my_isolated_cpus);
> +}
> +
> /*
> * These ascii lists should be read in a single call, by using a user
> * buffer large enough to hold the entire map. If read in smaller
> @@ -1733,6 +1748,9 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
> case FILE_EFFECTIVE_MEMLIST:
> seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->effective_mems));
> break;
> + case FILE_ISOLCPUS:
> + cpuset_seq_print_isolcpus(sf, cs);
> + break;
> default:
> ret = -EINVAL;
> }
> @@ -1893,6 +1911,12 @@ static struct cftype files[] = {
> .private = FILE_MEMORY_PRESSURE_ENABLED,
> },
>
> + {
> + .name = "isolcpus",
> + .seq_show = cpuset_common_seq_show,
> + .private = FILE_ISOLCPUS,
> + },
> +
> { } /* terminate */
> };
>
>



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